Mixed hydrophilic polyisocyanate curing agent

A polyisocyanate and curing agent technology, applied in the field of water-based polymer synthesis, can solve the problems of high cost, difficult condition control, complicated process, etc., and achieve the effects of less side reactions, simple operation and small particle size

Inactive Publication Date: 2017-04-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complicated process, high cost, and difficult condition control, there is no method of adding hydrophilic groups such as ethylene oxide units and sulfonic acid groups to polyisocyanate curing agents for hydrophilic modification.

Method used

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  • Mixed hydrophilic polyisocyanate curing agent
  • Mixed hydrophilic polyisocyanate curing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 60.0g of hexamethylene diisocyanate trimer to the three-necked flask, and pass nitrogen; add 9.0g of polyethylene glycol monomethyl ether with a functionality of 0.998, and then raise the temperature to 75°C to allow the contents of the container to fully react for 5 hour; then lower the temperature to 10°C, then slowly add 1.2g of sodium ethylenediaminoethanesulfonate, and continue the reaction for 20 minutes; finally, after reaching room temperature, stop feeding nitrogen, take out to obtain a mixed hydrophilic polyisocyanate solidified agent.

[0029] The -NCO content of the obtained mixed hydrophilic polyisocyanate curing agent was calculated to be 15.9%; its viscosity was measured to be 47.1 mPa·s; and its average particle size was measured to be 277.7 nm.

[0030] Infrared test is carried out to the mixed hydrophilic polyisocyanate curing agent obtained, figure 1 Its infrared spectrum, 2273cm -1 At -NCO, 1106cm -1 The ether bond absorption peak at , where -...

Embodiment 2

[0032] Add 70.0g of hexamethylene diisocyanate trimer to the three-necked flask, and pass nitrogen; add 3.5g of polyethylene glycol monomethyl ether with a functionality of 0.997, and then raise the temperature to 70°C to allow the contents of the container to fully react for 5 hours; then lower the temperature to 0°C, then slowly add 1.4g of sodium ethylenediaminoethanesulfonate, and continue the reaction for 30 minutes; finally, after reaching room temperature, stop feeding nitrogen, take out to obtain a mixed hydrophilic polyisocyanate solidified agent.

[0033] The -NCO content of the obtained mixed hydrophilic polyisocyanate curing agent was calculated to be 18.0%; its viscosity was measured to be 47.5 mPa·s; and its average particle size was measured to be 260.2 nm.

[0034] Infrared testing of the resulting mixed hydrophilic polyisocyanate curing agent, 2273cm -1 At -NCO, 1106cm -1 The ether bond absorption peak at , where -SO 3- The symmetric and asymmetric stretchi...

Embodiment 3

[0036]Add 70.0g of hexamethylene diisocyanate trimer to the three-necked flask, and pass through nitrogen; add 7.0g of polyethylene glycol monomethyl ether with a functionality of 0.998, and then raise the temperature to 75°C to allow the contents of the container to fully react for 5 hour; then lower the temperature to 20°C, then slowly add 0.7g of sodium ethylenediaminoethanesulfonate, and continue the reaction for 15 minutes; finally, after reaching room temperature, stop feeding nitrogen, take out to obtain a mixed hydrophilic polyisocyanate solidified agent.

[0037] The -NCO content of the obtained mixed hydrophilic polyisocyanate curing agent was calculated to be 17.3%; its viscosity was measured to be 51.3 mPa·s; and its average particle size was measured to be 248.3 nm.

[0038] Infrared testing of the resulting mixed hydrophilic polyisocyanate curing agent, 2273cm -1 At -NCO, 1106cm -1 The ether bond absorption peak at , where -SO 3 - The symmetric and asymmetric...

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Abstract

The invention relates to a mixed hydrophilic polyisocyanate curing agent, and belongs to the field of waterborne high polymer synthesis. The mixed hydrophilic polyisocyanate curing agent is prepared through a "two-step system" by taking polyglycol monoether, polyisocyanate and sulfamate as raw materials. The mixed hydrophilic polyisocyanate curing agent comprises hydrophilic groups such as sulfonic groups and ether groups, and can be dispersed in water very well. The content of isocyanato of the mixed hydrophilic polyisocyanate curing agent is above 11.3wt%, an emulsion of the mixed hydrophilic polyisocyanate curing agent is small in particle size and low in viscosity and is stable. The mixed hydrophilic polyisocyanate curing agent can be used for a bi-component waterborne polyurethane curing cross-linking agent, and has application values in the fields of waterborne polyurethane wood lacquer, fabric coatings, leather finishes, waterborne adhesives, and the like.

Description

technical field [0001] The invention relates to a mixed hydrophilic polyisocyanate curing agent, which belongs to the field of water-based polymer synthesis. Background technique [0002] Polyisocyanate curing agent is a kind of substance that promotes or controls the curing reaction prepared from polyisocyanate. The composition and structure of polyisocyanate are relatively stable, but the cross-linkable isocyanate group (-NCO) contained in polyisocyanate is very easy to react with water. Therefore, in order to enable the polyisocyanate curing agent to be mixed with water but not to react with water, it is necessary to perform hydrophilic modification on the polyisocyanate curing agent. The synthetic hydrophilic polyisocyanate curing agent is to add an emulsifier to the polyisocyanate or introduce a hydrophilic group into the chain so that the polyisocyanate can be stably dispersed in water, so that it can fully react with the hydroxyl component and speed up the drying tim...

Claims

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Application Information

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IPC IPC(8): C08G18/48C08G18/79C08G18/38C09D175/08
CPCC08G18/4833C08G18/3855C08G18/797C09D175/08
Inventor 罗运军尹绚柴春鹏葛震
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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